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arXiv 1807.09558gr-qc
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双标量理论中的宇宙演化

The evolution of universe in the two-scalar theory

Jia-Cheng Ding, Ping Li, Cong Li, Qi-Qi Fan, Jian-Bo Deng

摘要:

利用变分方法将f(R,T)引力推广到包含两个独立标量场的双标量理论,并利用保角变换导出了Einstein坐标系下的场方程.在Friedmann方程和Raychaudhuri方程的基础上,考虑宇宙的完全流体形式,进一步讨论了宇宙的加速膨胀条件。在双标量理论中,宇宙有加速膨胀和减速收缩两种状态,其演化过程有三个阶段。第一和第三级处于加速膨胀状态,第二级处于减速收缩状态。第三阶段代表现在的宇宙,它趋向于成为一个尘埃宇宙。

英文摘要:

We generalize f(R,T) gravity into the two-scalar theory that includes two independent scalar fields by the variational method, and we derive its field equations in Einstein frame using conformal transformation. Based on Friedmann equations and Raychaudhuri equation, with a consideration of the cosmic content as its perfect-fluid form, a further discussion leads us to an accelerated expanding condition of universe. In the two-scalar theory, universe has two states which are the accelerated expansion and decelerated contraction, and it has three stages during its evolution. The first and third stages are in the accelerated expanding state, and the second stage is in the decelerated contracting state. The third stage represents the present universe and it tends to become a dust universe.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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